ipp.linuxnet.cloud has no MX records.
Question and response
Question
dig ipp.linuxnet.cloud. MX
Answer
The response has no answer records.
Authority
linuxnet.cloud. 1800 SOA david.ns.cloudflare.com. dns.cloudflare.com. 2397166311 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0